01 What makes it unique
The 39RK is the freshest sheet metal in the roster, and dealer walkthroughs draw it in full: a U-shaped kitchen wraps the rear wall, a 100-inch L-shaped sofa and theater seating fill the living slide-outs, a desk and coffee bar run the interior wall, a half bath serves the living area with the full bath forward, and the front suite carries a king. Two awnings (19 and 15 feet) cover the camp side.
The record demands the respec note: Heartland stretched this plan mid-cycle. The early-2026 print and the RVUSA record still show a 40-foot-4, 14,080-pound unit at a 17,300-pound GVWR; the current factory page prints 43 feet 3, 15,200 pounds dry and an 18,200-pound GVWR — figures the June-2026 dealer-network brochure and dealer listings confirm. The current set is used, ties out exactly (15,200 plus 3,000 equals 18,200), and rides tandem 8,000-pound axles under the full Bighorn platform: drop frame, 102-inch body, CoreShield walls, ThermaShield zero-degree package, dual Whisper Quiet air, tankless water heater and the mandatory Premium Package.
The 3,000-pound cargo capacity is the best in the line — the full-timer’s number, absorbing a filled 75-gallon fresh tank with two-thirds of the margin left. The 2,960-pound pin is one-ton work. Cross-shopping the 36RK: this is the same rear-kitchen idea with the half bath, the king, the desk wall and 165 more pounds of margin, for $2,182 more at Base MSRP.
02 Full specifications
Dimensions
- Exterior length
- 43' 3"
- Exterior width
- 8' 6"
- Exterior height
- 12' 6"
- Interior height
- 8' 7"
Weights
- Dry / unit base weight
- 15,200 lbs
- GVWR (max loaded)
- 18,200 lbs
- Net cargo / payload (CCC)
- 3,000 lbs
- Dry pin weight
- 2,960 lbs
Capacities
- Fresh water
- 75 gal
- Grey water
- 87 gal
- Black water
- 50 gal
- Refrigerator
- GE 21 cu ft residential
Construction
- Frame
- 12″ steel I-beam · drop frame
- Sidewalls
- CoreShield 2″ laminate · high-gloss gel coat
- Front cap
- Painted fiberglass · clearcoat · LED
- Roof
- TrussXL truss · Alpha membrane (limited lifetime)
Running gear
- Axles (factory)
- 2 x 8000
- Hitch
- Fifth wheel · dry pin 2,960 lb
- Tires
- 215/75R17.5'H'
- LP
- 90 lb total
Galley & systems
- Refrigerator
- GE 21 cu ft residential · 1,800W inverter
- A/C
- 2 × 15,000 BTU Whisper Quiet
- Water heater
- Tankless
- Furnace
- 40,000 BTU
Sleeping & layout
- Sleeps
- Up to 4 (factory)
- Primary bed
- King bed
- Layout
- Rear U-kitchen triple-slide — U-shaped galley across the rear, 100-inch L-sofa and theater seating, desk and coffee bar, bath-and-a-half, front king bedroom, 19-foot + 15-foot awnings
- Awnings & entries
- 2 · 19′ + 15′ · 1 entry (RVUSA)
03 Bighorn floorplan family
Heartland's Bighorn line — the flagship luxury fifth wheel of the relaunched range: seven 2026 floorplans, every one a 102-inch wide-body on a 12-inch steel I-beam drop frame with a painted fiberglass front cap, CoreShield laminated sidewalls in high-gloss gel coat, the ThermaShield zero-degree package with a 40,000-BTU furnace, two 15,000-BTU Whisper Quiet air conditioners, and a mandatory Premium Package that includes six-point hydraulic auto-leveling, a GE 21-cubic-foot residential refrigerator with an 1,800-watt inverter and a GE appliance suite. All seven plans are profiled in depth on the Bighorn hub with verified weights.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 31RL | 36 ft | 4 | Rear-living entry — shortest, lightest, friendliest pin |
| 36RK | 40 ft | 4 | Rear-kitchen plan — the galley takes the back wall |
| 38RE | 43 ft | 4 | Rear-entertainment quad-slide — most-listed; 137-gal grey |
| 37MD | 43 ft | 8 | Middle-den quad-slide — two living zones |
| 39RK | 43 ft | 4 | Rear U-kitchen, bath-and-a-half — respec’d stretch; best margin |
| 39FL | 44 ft | 4 | Front-living flagship — five slides, heaviest pin |
| 40DB | 44 ft | 8 | Two bedrooms, two full baths — the multi-family flagship |
Every Bighorn is a 102-inch wide-body on the 12-inch I-beam drop frame, and the Premium Package is mandatory — its content (hydraulic auto-level, the GE residential appliance suite with inverter, central vacuum, gel-coat sidewalls) is part of the Base MSRP shown. This is a published-GVWR-clean line: dry plus cargo equals the printed GVWR exactly on all seven plans. RVUSA and the library brochure carry an early-print weight set superseded on five plans — the current factory pages and the June-2026 dealer-network brochure agree exactly and are used throughout (the 39RK was respecified from a 40-foot-4 two-slide draft to the current 43-foot-3 three-slide build, logged). Dealer placards typically run above Base MSRP while negotiated street pricing runs below it. A fifth wheel loads its pin into the truck bed — confirm the pin weight against the tow vehicle's payload placard, not its tow rating.
04 What owners & reviewers report
The mid-cycle respec (logged)
Early-2026 print and RVUSA still carry a 40-foot-4 / 14,080-pound unit; the current factory page, June-2026 brochure and dealer stock all show the stretched 43-foot-3 / 15,200-pound coach used here. Verify which build a physical unit is.
Best margin in the line
3,000 pounds of cargo capacity — the number that makes this the full-timer’s pick of the roster.
Bath and a half
A half bath off the living area plus the full forward bath — the guest-and-morning-rush solution long coaches justify.
Placard vs street pricing
Dealer window stickers on this plan ran $144-146k against the $123,975 factory Base MSRP, while advertised street prices ran $101-105k on the probe day — the spread on one floorplan. The factory figure anchors this page; negotiate from there.
05 How it compares
The original rear-kitchen plan — three feet shorter and $2,182 less, without the half bath or desk wall.
The two-bedroom, two-bath family alternative at the same length class.
The luxury rear-kitchen field — the 39RK counter is the bath-and-a-half, the 3,000-pound margin and the standard residential suite.